Pre-construction work has begun for Seaport Square’s M1M2 residential component, which is slated to include three towers housing a combined 735 condos and apartments. Cottonwood Management Group has started initial site work on the 3.5-acre site in Seaport Square set to feature the three towers.

Two of the three towers will contain condos. At least 455 of the total 735 units will be condos, Tom Acitelli reports for Curbed.

In addition to residential units, M1M2 will have 125,000 square feet of retail and restaurant space as well as a public courtyard. The project site is next to Cottonwood’s East Coast offices located at 101 Seaport Boulevard. The tower, rising 17 stories, was completed in 2015 and was the first office tower in Seaport Square.

Construction of M1M2 is slated to be completed by early 2020. An official groundbreaking ceremony is planned for May, following the completion of pre-construction work.